干燥条件下混凝土中氧气扩散的跨尺度预测模型

IF 2.7 3区 工程技术 Q3 ENGINEERING, CHEMICAL
Chuanye Su, Jun Xu, Wei She, Chuanqing Fu
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引用次数: 0

摘要

氧扩散速度直接影响混凝土中氧浓度的分布,进而影响混凝土中钢筋的腐蚀性能。然而,关于干混凝土中氧扩散的跨尺度预测模型的研究仍然缺乏。本研究将混凝土复杂的孔隙结构简化为海绵模型,并根据孔径分布密度函数对三种扩散类型进行了定量表征。考虑了孔隙率、水灰比、水化程度、凝胶空隙率和孔隙迂回度对氧扩散系数的影响,建立了干硬性混凝土中氧扩散的跨尺度预测模型。其次,利用自主研发的氧扩散系数测定装置测量了干燥条件下混凝土试件的氧扩散系数。结果表明,实验值与计算值吻合良好,并将该模型与其他学者提出的模型进行了比较,验证了其优越性和准确性。最后,对五个微尺度参数进行了参数敏感性分析,讨论了它们对混凝土中氧气传输行为的影响。干拌混凝土中氧扩散跨尺度预测模型的建立,首先将为钢筋膨胀开裂的理论研究提供积极的作用,其次能够更好地解释混凝土中氧扩散的机理。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Cross-Scale Prediction Model of Oxygen Diffusion in Concrete Under Dry Conditions

Cross-Scale Prediction Model of Oxygen Diffusion in Concrete Under Dry Conditions

Cross-Scale Prediction Model of Oxygen Diffusion in Concrete Under Dry Conditions

The rate of oxygen diffusion directly affects the distribution of oxygen concentration within concrete, which in turn influences the corrosion performance of reinforcing steel within the concrete. However, research on cross-scale prediction models for oxygen diffusion in dry concrete is still lacking. In this study, the complex pore structure of concrete is simplified into a sponge model, and three types of diffusion are quantitatively characterized based on the pore size distribution density function. The influence of porosity, water–cement ratio, hydration degree, gel–space ratio and pore tortuosity on the oxygen diffusion coefficient is considered, and a cross-scale prediction model for oxygen diffusion in dry concrete is established. Secondly, an oxygen diffusion coefficient determination device developed independently is used to measure the oxygen diffusion coefficient of concrete specimens under dry conditions. The results show that the experimental values agree well with the calculated values, and the model is compared with other models proposed by scholars, verifying its superiority and accuracy. Finally, a parameter sensitivity analysis is conducted on five microscale parameters and their influence on the behavior of oxygen transmission into concrete is discussed. The establishment of the cross-scale prediction model for oxygen diffusion in dry concrete will first provide a positive role in the theoretical research on reinforcement expansion and cracking, and secondly, it will be able to better explain the mechanism of oxygen diffusion in concrete.

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来源期刊
Transport in Porous Media
Transport in Porous Media 工程技术-工程:化工
CiteScore
5.30
自引率
7.40%
发文量
155
审稿时长
4.2 months
期刊介绍: -Publishes original research on physical, chemical, and biological aspects of transport in porous media- Papers on porous media research may originate in various areas of physics, chemistry, biology, natural or materials science, and engineering (chemical, civil, agricultural, petroleum, environmental, electrical, and mechanical engineering)- Emphasizes theory, (numerical) modelling, laboratory work, and non-routine applications- Publishes work of a fundamental nature, of interest to a wide readership, that provides novel insight into porous media processes- Expanded in 2007 from 12 to 15 issues per year. Transport in Porous Media publishes original research on physical and chemical aspects of transport phenomena in rigid and deformable porous media. These phenomena, occurring in single and multiphase flow in porous domains, can be governed by extensive quantities such as mass of a fluid phase, mass of component of a phase, momentum, or energy. Moreover, porous medium deformations can be induced by the transport phenomena, by chemical and electro-chemical activities such as swelling, or by external loading through forces and displacements. These porous media phenomena may be studied by researchers from various areas of physics, chemistry, biology, natural or materials science, and engineering (chemical, civil, agricultural, petroleum, environmental, electrical, and mechanical engineering).
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